Dental appliance



Feb. 26 192 1,484,800

1. J. STARK DENTAL PPL ANCE Filed Dec". 1922f WITNESSES I llVl/E/Vm fi w v d coa ism/M ATTORNEYS Patented Feb. 26, 1924.

Littfitt FEE Q JACOB If. STARK, 0F Bl'tOOKLyNpNEw YoBfif DENTAL" APPLIANCE.

Application filed December T0 all-whom it may concern:

Be it known that I, JACOB J. STARK, a

citizen: of the United: States, and a resident ofit'he city of New York, boroughof Brooklyn ,-in the county of Kings and State of New'York, haveinventedcertain new and Improved Dental Appliances, of which the following is a full, clear, and exact description.

This invention has for its principal object toprovide a new and valuable apparatus for quickly preparing a dental molds for use in casting metal fillingsa Accord'ing -topri'or practice, the mould while confined in a tubular flask to provide openings in the flask at the bottom aswell asthe -top thereof, is inverted, that=is, an ranged so that'the mold-gate is lowermost, and thereupon heat is applied thereto, to drive'off water and steam in an upwarddirection-yand simultaneously melt and drain oli by gravity and by way of such gate, the

fusiblematerial 'of' the cavity-form about which, in a manner well known, the cementitious:orother suitalolematerial of the mold was previously allowed to set.

An important object of the present invention is to provide, preferably as a grav: ity mounted attachment orcap--device for an ordinary Bunsen burner, a novel structure-to receiveand support the mold and carryin a permanently incorporated drain age'me'ans for the fusedmaterial of the cavity-form, with the burner proper having'fuel "and*flamefdischarging and guiding openings and surfaces so' shaped and relatedas to direct the'flam'es upwardly and inwardly toward the center of the mold. support to approach the mold flash radially and =-preferably intermediate the top and bottom thereof.

\Vith these and-various other-objects in view, theinvention consists-in certain novel features of construction, combinations and arrangements of parts, and steps and proceedin'gs,-as willbe hereinafter described and pointed out in the claims.

The invention will be more clearly understood from the following description, when taken in connection with the accompanying drawing, showing a preferred form of apparatus constructed pursuant to the invention.

In this drawing:

Fig. 1 is a vertical axial section through the new burner and the parts associated 5, 1922;. Serial'lil'o; 605,133.

therewith, certain of the othei parts being shownin elevation; and

Fig. 2 is a transverse section-taken on line 2 2"of Fig. '1, andshowingthe underside of the burner plate.

At 3 in Fig. 1 is shown a conventional Bunsen burner having'an air inlet as indicated-=at 4and a gas feeding connection 5.

The newburner andthe parts associated therewith include merely a burner plateG, a bowl-like plate or cu=p 7, a drain-pipe 8 leading as shown from'near the bottom- 0f a centrally dished porti'on l) of plate 6, and two screws 10 for-securing the burner plate on top of the cup 7, to establish, due to the just-mentioned shaping of the parts, a fuelreceivlng and distributing chamber 11.

Cup 7 hasa central opening communicatmg with the open upper end of tubeB and surrounded by a depending collar 12 having air-upwardly tapered bore-to fit about the familiar coned upper end of the tube Draiirpipe 8 opens atits upper end into the centrally dished portion of burner plate 6, and below its drainage communication with such portion passes through chamber '11 and thencethrough a suitable opening in cup 7 to extend as illustrated and discharge the drained material aslndicated by the arrow 14 into a suitable receptacle (not shown).

A very important feature of 't he'new construction -is the shaping-of the peripherally flames asindic'ated by the arrows 16 of Fig.

1, that is, upwardly and inwardly toward the vertical axis of the burner and above the burner plate 6; so that a flask of any'type I and housinga dental mold 17, such as the flask 18 illustrated, maybe' uniformly heated when set on top of'the burnerplate merely by gravity. An important incidental advantage of the flame control as just described, is the fact that the peripheral The orfices 15 are separated, pursuant to conventional gas-burner construction, by means of a peripheral series of short ribs marked 19 in Fig. 2; the flame control resulting from the fact that the underside of the peripheral edge of burner plate 6 is curved in cross-section as indicated in Fig. 1 and as marked 20 in Fig. 2, in combination with the gas-guiding surfaces of members 6 and 7 forming bounding walls of chamber 11 and the cross-sectional characteristics of such chamber.

In utilizing the just-described apparatus pursuant to the invention, the mold 17, if flasked, is preferablyprovided with a flask 18 in the shape of a cylindrical tube as illus trated, or'even a flask of cup-shape as indicated by the broken line 21. of Fig. 1, provided openings are formed near the end of the flask where closed.

As the flask 18 is shown in Fig. 1, the same is inverted, and it will be seen that the mold is so shaped as to provide a conical gate 22 leading to the mold cavity 23 corresponding to the cavity in the patients tooth. As well understood, the materialof the mold 17 is set about a cavity-form 2d of wax or other suitable plastic and fusible material. It is also well known that such mold must be dried by heat and the cavity-form 2st and its sprue 25 removed before molten gold or the other selected material for the cavity filling is poured into the mold. "With flask 18 constructedeas hereinabove explained, itwill be seen that it is very simple and easy operation to quickly prepare the mold, when once set about the cavity-form, for the making of a dental cast, when the new burner is used in connection therewith, so that the flames following the arrows 16 impinge against a circumferential section of the flaskbetween the top and bottom thereof when the flask is inverted as shown in Fig. 1.

It will be understood that the flames are.

thus guided tothe exterior of the flask to drive off water and steam while simultaneously fusing the cavit -form and draining out the cavity by gravity, and at the same time the drainage means is heated sufficiently by conduction to permit the latter to afford an unrestricted flow of the fused material in a heated and hence very liquid condition. V

It should be understood in conclusion that the invention as above described may be varied considerably, and is susceptible to a number of d fferent adaptatlons, without departure from the spirit of the invention as defined in the appended claims.

I claim: r

1. In an appliance for drying out a dental mold and fusing and flowing out the cavityform, the combination of a structure including a plate for supporting the mold, drainage means carried by the structure for the fluid from the fused cavity-form, fuel-discharging means carried by the structure along a circumferential line surrounding the upper portion. of the drainage means and constituting a burner for heating the mold and simultaneously heating the drainin means. r r

2. The appliance defined in claim' 1, wherein said burner includes, a plurality of spaced orifices, said orifices being shaped to delivery upwardly and inwardly directed flames all around said line. i

3. In an appliance for drying out a dental mold and fusing and flowing out the cavityform, the combination of a structure including a circular plate having a downwardly dished central portion, a drain pipe into which the dished portion opens, a bowlshaped plate underlying the first plate and partially surrounding said pipe, the adjacent circular edges of the two plates being shaped therebetween to provide a plurality of outwardly and upwardly directed passages for the emission of a gaseous fuel to' direct flames therefrom upwardly and inwardly over the upper plate when such fuel is ignited.

4. In an appliance for drying out a dental mold and fusing and flowing out the cavity form, the combination of a structure including a circular plate having a downwardly dished central portion, a drain pipe into whlch the dished portlon opens, a bowlshaped plate underlying the first plate and 7 partially surrounding said pipe, said plates being shaved to establish a chamber therebetween, the marginal end portion of the up to direct the flames from the fuel when ignited, upwardly and inwardly toward the .center of the upper plate.

JACOB J. STARK. 

